We divide 81644821 by 668
The aim is to understand the frequency of 668 in 81644821.

On to step 1:
If we divide 8 by 668, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 668

Moving on to step 2:
When dividing 81 by 668, we get 0 with a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Include the next digit (6) from the dividend after 81, then repeat: 816 / 668

Let's proceed to step 3:
When dividing 816 by 668, we get 1 with a remainder of 148.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 668 away from 816, we end up with 148.
Bring next digit (4) of the dividend behind the 148 and repeat the process: 1484 / 668

Advancing to step 4:
668 goes into 1484 2 times with a remainder of 148.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
The remainder is 148 after subtracting 1336 from 1484.
Take the next digit (4) from the dividend and append it to 148, then repeat: 1484 / 668

Advancing to step 5:
1484 divided by 668 is 2 with a remainder of 148.
Write down 2 as next digit of the result. 
Result so far: 122.0
If we take 1336 away from 1484, we end up with 148.
Fetch the next digit (8) from the dividend, attach it to 148 and continue: 1488 / 668

Let's proceed to step 6:
The number 668 fits into 1488 2 times, leaving a remainder of 152.
The number 2 becomes the next digit in our result. 
Result so far: 1222.0
Subtracting 1336 from 1488 leaves us with 152.
Fetch the next digit (2) from the dividend, attach it to 152 and continue: 1522 / 668

On to step 7:
When dividing 1522 by 668, we get 2 with a remainder of 186.
Write down 2 as next digit of the result. 
Result so far: 12222.0
If we take 1336 away from 1522, we end up with 186.
Fetch the next digit (1) from the dividend, attach it to 186 and continue: 1861 / 668

On to step 8:
When dividing 1861 by 668, we get 2 with a remainder of 525.
Write down 2 as next digit of the result. 
Result so far: 122222.0
Subtracting 1336 from 1861 leaves us with 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

Going ahead to step 9:
668 can be fit into 5250 7 times, resulting in a remainder of 574.
The next digit of our result is 7. 
Result so far: 122222.7
If we subtract 4676 from 5250, we get 574.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

On to step 10:
When dividing 5740 by 668, we get 8 with a remainder of 396.
Write down 8 as next digit of the result. 
Result so far: 122222.78
If we take 5344 away from 5740, we end up with 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

Going ahead to step 11:
668 can be fit into 3960 5 times, resulting in a remainder of 620.
Put 5 as the next digit of the answer. 
Result so far: 122222.785
The remainder is 620 after subtracting 3340 from 3960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Advancing to step 12:
668 can be fit into 6200 9 times, resulting in a remainder of 188.
The next digit of our result is 9. 
Result so far: 122222.7859
Subtract 6012 from 6200 to get 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Let's proceed to step 13:
If we divide 1880 by 668, we get 2 and a remainder of 544.
Write down 2 as next digit of the result. 
Result so far: 122222.78592
Subtracting 1336 from 1880 leaves us with 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

Advancing to step 14:
668 can be fit into 5440 8 times, resulting in a remainder of 96.
Put 8 as the next digit of the answer. 
Result so far: 122222.785928
Subtract 5344 from 5440 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Moving on to step 15:
668 goes into 960 1 times with a remainder of 292.
The number 1 becomes the next digit in our result. 
Result so far: 122222.7859281
Subtracting 668 from 960 leaves us with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Moving on to step 16:
The number 668 fits into 2920 4 times, leaving a remainder of 248.
The number 4 becomes the next digit in our result. 
Result so far: 122222.78592814
Deduct 2672 from 2920 and we're left with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

After the division, we end up with 122222.78592814 and a remainder of 2.48e-07.